Search results for "Stars: CME"

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A stellar flare-coronal mass ejection event revealed by X-ray plasma motions

2019

Coronal mass ejections (CMEs), often associated with flares, are the most powerful magnetic phenomena occurring on the Sun. Stars show magnetic activity levels up to 10^4 times higher, and CME effects on stellar physics and circumstellar environments are predicted to be significant. However, stellar CMEs remain observationally unexplored. Using time-resolved high-resolution X-ray spectroscopy of a stellar flare on the active star HR 9024 observed with Chandra/HETGS, we distinctly detected Doppler shifts in S XVI, Si XIV, and Mg XII lines that indicate upward and downward motions of hot plasmas (~10-25 MK) within the flaring loop, with velocity v~100-400 km/s, in agreement with a model of fl…

Angular momentumX-ray Astronomy010504 meteorology & atmospheric sciencesAstrophysics::High Energy Astrophysical PhenomenaStars: flareFOS: Physical sciencesAstrophysicsKinetic energy01 natural scienceslaw.inventionSpitzer Space Telescopelaw0103 physical sciencesCoronal mass ejectionAstrophysics::Solar and Stellar AstrophysicsStars: coronae010303 astronomy & astrophysicsSolar and Stellar Astrophysics (astro-ph.SR)0105 earth and related environmental sciencesLine (formation)PhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Astronomy and AstrophysicsStarsAstrophysics - Solar and Stellar AstrophysicsStellar physicsPhysics::Space PhysicsStars: CMEAstrophysics::Earth and Planetary AstrophysicsAstrophysics - High Energy Astrophysical PhenomenaFlare

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